CN104789718A - Steel slag recycling method - Google Patents
Steel slag recycling method Download PDFInfo
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- CN104789718A CN104789718A CN201510109842.5A CN201510109842A CN104789718A CN 104789718 A CN104789718 A CN 104789718A CN 201510109842 A CN201510109842 A CN 201510109842A CN 104789718 A CN104789718 A CN 104789718A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention relates to a steel slag recycling method. The method comprises the following steps: carrying out mixing pretreatment on 100DEG C or above steel slag and 30-40DEG C steel slag, and carrying out multi-time magnetic separation, multi-time screening and multi-time fragmentation for recovery in order to obtain a low-iron metallurgy production auxiliary material substitute; and carrying out magnetic separation on a magnetic separation material in the steel slag, grinding, screening, and carrying out dry wind magnetic separation for recovery in order to obtain a high-iron metallurgy production auxiliary material substitute. The method reduces the smelting cost of a steel plant, reduces the exploitation and calcination of natural ore, reduces the discharge of greenhouse gas, has very good environmental protection benefit, and realizes short flow and high recovery utilization of the steel slag.
Description
Technical field
The present invention relates to the recycling method of a kind of waste of metallurgy industry, be specifically related to a kind of recoverying and utilizing method of steel slag.
Background technology
Approximately nearly 100,000,000 tons of the steel slag that metallurgical steel mill discharges every year, steel slag is liquid molten shape when discharging, not only containing a large amount of heats, and with have an appointment about 10% the residual steel of impurity (so-called " impurity "-cinder ladle iron, iron cinder inclusion form), and many useful compositions such as a large amount of oxide complexs and beneficial element.And many slags are not because obtaining effective processing and utilization, need a large amount of stacking, both soil, a large amount of farmland had directly been occupied, its dust and rainwater wash away in a large number simultaneously, make Calcium oxide dissolution in water, cause again neighbouring alkalization of soils, Its Adjacent Waters or river pH value raise, severe contamination surrounding enviroment, constitute the difficult point of iron and steel enterprise's environmental management.Therefore, from the development angle of recycle and recycling economy thereof, the high value that slag has resource recovery utilizes potential, and being precious all over the body, is the secondary resource having value of exploiting and utilizing.
Along with the high development of modernization industry, more and more high to the requirement of steel product quality, as deep drawing steel, pipe line steel, stainless steel and ultralow phosphorus, ultralow-sulfur steel etc.The quality of steel products is mainly reflected in surface quality and inner quality two aspects, and one is that harmful element (S, P, H, O, N, even C) content is low; Two is that non-metallic inclusion (especially brittle inclusion) content is low.In metallurgical production, Clean Steel be greatly developed, must by adding corresponding various metallurgic auxiliary materials, by the impurity element (S, P, H, O, N, C) in molten steel and non-metallic inclusion sex change or removal.The cost of steel mill's metallurgic auxiliary materials accounts for 30% of steel mill's machine Material Cost, depressed at current metallurgy industry, and under the dispirited not good overall situation of steel market, cost efficiency is the important means that Steel Plant pull through their difficulties.Do not affecting steel product quality and tap to tap time, seeking the Some substitute product of metallurgic auxiliary materials, the purchase cost reducing metallurgic auxiliary materials is to greatest extent the optimal selection of Steel Plant's cost efficiency and most effective way.
Due to the product that steel slag is smelting iron and steel, according to " similar compatibility " principle, adopt steel slag Substitute For Partial metallurgic auxiliary materials to be used for smelting technology to have a negative impact to steel product quality, because steel slag belongs to " pre-melt ", its useful component and metallurgic auxiliary materials main component similar, adopt steel slag Substitute For Partial metallurgic auxiliary materials, both the disadvantageous effect of steel slag solid waste accumulation to environment had been solved, achieve again the short route recycle of solid waste resource, also for Steel Plant's cost efficiency has made very large contribution.
Therefore, utilize steel slag " pre-melt " as base-material, developing a kind of steel slag for steel slag is the process difficulties that Sci-tech Staff In Metallurgical Industry is eager to solve for the recoverying and utilizing method of metallurgical production auxiliary material.
Summary of the invention
The object of the invention is to the defect overcoming prior art, a kind of recoverying and utilizing method of steel slag is provided, through repeatedly magnetic separation after more than 100 DEG C steel slags and 30 DEG C-40 DEG C steel slag mixing pre-treatment, repeatedly sieve, repeatedly the method such as broken reclaims the substitute obtaining low iron metallurgical production auxiliary material, in steel slag, magnetic separation material is through magnetic separation, grinding, the methods such as screening and the magnetic separation of dry method wind-force reclaim the substitute obtaining high ferro metallurgical production auxiliary material, realize Steel Plant and reduce smelting cost, reduce exploitation and the calcining of natural crystal, reduce greenhouse gas emission, there is fine environmental benefit, reach steel slag short route and high recycling object simultaneously.
The present invention is achieved by the following technical solutions:
A recoverying and utilizing method for steel slag, comprises the steps:
Carry out first time screening after more than (1) 100 DEG C steel slag and 30 DEG C-40 DEG C steel slag mixing pre-treatment and obtain particle diameter >=250mm steel scrap and particle diameter < 250mm steel slag;
(2) described particle diameter < 250mm steel slag carries out first time magnetic separation and obtains particle diameter < 250mm magnetic separation material and particle diameter < 250mm first time magnetic separation steel slag;
(3) described first time magnetic separation steel slag carry out second time screening obtain particle diameter <80mm steel slag and 80mm≤particle diameter < 250mm steel slag;
(4) described particle diameter <80mm steel slag carries out second time magnetic separation and obtains particle diameter < 80mm magnetic separation material and particle diameter < 80mm second time magnetic separation steel slag;
(5) described second time magnetic separation steel slag carry out third time screening obtain particle diameter <20mm steel slag and 20mm≤particle diameter < 80mm steel slag, described 20mm≤particle diameter < 80mm steel slag be used as slag former;
(6) described particle diameter <20mm steel slag carries out third time magnetic separation and obtains particle diameter < 20mm magnetic separation material and particle diameter < 20mm third time magnetic separation steel slag;
(7) described third time magnetic separation steel slag carries out the 4th screening and obtains particle diameter <2mm steel slag and 2mm≤particle diameter < 20mm steel slag, and described particle diameter <2mm steel slag is used as sweetening agent or sintering circuit flux.
Described steel slag can be converter slag or refining slag.
Preferably, the mass ratio of described more than 100 DEG C steel slags and described 30 DEG C of-40 DEG C of steel slags is 1:2-3, pretreatment time 8-12 hour.Mix will be carried out more than more than 100 DEG C steel slags and cold conditions normal temperature steel slag (30 DEG C of-40 DEG C of steel slags) in fixing slag chute, utilize more than 100 DEG C steel slag heats by while moisture evaporation in mixing slag, the mixture of steel slag and slag iron and steel is heated stress, because Young's modulus is different, cracking after deformation in various degree can be produced, slag steel surface scum silica frost can peel off, block steel slag is due to hydration reaction expansion meeting efflorescence, particle diameter diminishes, and meets conveyor sorting and magnetic separation requirement.
Preferably, after described more than 100 DEG C steel slags and described 30 DEG C-40 DEG C steel slag mixing pre-treatment, water ratio is below 5wt%, calcium oxide content 40wt%-62wt%, all iron content >=20wt%.
Preferably, 80mm described in step (3)≤particle diameter < 250mm steel slag returns step (3) or carries out described second time magnetic separation to step (4) after fragmentation.
Preferably, 2mm described in step (7)≤particle diameter < 20mm steel slag returns step (6) and re-uses after fragmentation.
Calcium oxide content >=the 42wt% of above-mentioned 20mm≤particle diameter < 80mm steel slag, average activity degree 260 ~ 300, water ratio≤2wt%, calcium oxide content >=the 42wt% of described particle diameter <2mm steel slag, average activity degree 320 ~ 350, water ratio≤1wt%, 18wt%≤all iron content≤60wt%, as 20wt%≤all iron content≤60wt%.
Above-mentioned particle diameter >=250mm steel scrap obtains high-purity slag steel by flame cutting.
Preferably, the recoverying and utilizing method of above-mentioned steel slag, also comprises the steps:
(8) carry out magnetic separation removal tailings after above-mentioned particle diameter < 250mm magnetic separation material, above-mentioned particle diameter < 80mm magnetic separation material and above-mentioned particle diameter < 20mm magnetic separation material being mixed and obtain mixing magnetic separation material;
(9) described mixing magnetic separation material carries out screening and obtains particle diameter >=20mm magnetic separation material and particle diameter < 20mm magnetic separation material;
(10) described particle diameter >=20mm magnetic separation material carries out magnetic separation removal tailings and obtains 20mm≤particle diameter < 100mm magnetic separation material after grinding and screening, and described 20mm≤particle diameter < 100mm magnetic separation material is used as steel-making refrigerant;
(11) described particle diameter < 20mm magnetic separation material is dried and is carried out magnetic separation and screening after grinding, obtain 3mm≤particle diameter <20mm magnetic separation material and particle diameter < 3mm magnetic separation material, described 3mm≤particle diameter <20mm magnetic separation material is used as steel making oxygen agent or steel-making refrigerant.
Preferably, described particle diameter < 3mm magnetic separation material obtains particle diameter < 3mm bis-magnetic separation material through the magnetic separation of dry method wind-force, is used as steel making oxygen agent or refrigerant after described particle diameter < 3mm bis-magnetic separation material pelletizings.The magnetic separation of dry method wind-force can adopt magnetic roller to sort magnetic separation material, be equipped with pressurized air as the interference medium eliminating magnetic separation fine powder magnetic coagulation, preferably, the magnetic pole Gradient distribution of magnetic roller is cylinder table magnetic induction density 1000-3500Gs, pressurized air is anhydrous without oil, pressure 0.15-0.35MPa.
The recoverying and utilizing method of above-mentioned steel slag, all iron content >=the 96wt% of described 20mm≤particle diameter < 100mm magnetic separation material, sulphur content≤0.04wt%, all iron content >=the 90wt% of described 3mm≤particle diameter <20mm magnetic separation material, sulphur content≤0.04wt%, all iron content >=the 80wt% of described particle diameter < 3mm bis-magnetic separation material, sulphur content≤0.04wt%.
The above-mentioned screening plant that is sieved through is as vibratory screening apparatus.
Above-mentioned magnetic separation by concentration equipment as single, double roller magnetic separator, magnetic drum preparator, special dry method fine powder purifying machine.
Above-mentioned grinding by milling apparatus as rod mill, ball mill.
Above-mentioned oven dry by drying unit as rotary drum dryer.
Through the recoverying and utilizing method of above-mentioned steel slag, tailings metal Ferrum content≤1wt%, achieve abundant recovery and the high value added utilization of iron resources in steel slag, the short route achieving useful chemical composition CaO, MgO, MnO in steel slag tailings returns Commercial cultivation.The alternative metallurgic auxiliary materials of the product obtained by the recoverying and utilizing method of above-mentioned steel slag, can be reduced natural lime consumption, reduces steel scrap consumption, reduce oxidant consumption etc., while reducing smelting cost, produce huge environmental benefit.
Technique effect of the present invention and advantage are:
(1) recoverying and utilizing method of steel slag of the present invention reclaims the substitute obtaining metallurgical production auxiliary material from steel slag, can be used for hot metal pretreatment station and converter smelting different times, substitute slag former, sweetening agent, sintering circuit flux, metallurgical production auxiliary material such as steel-making refrigerant or steel making oxygen agent etc. respectively, realize Steel Plant and reduce smelting cost, reduce exploitation and the calcining of natural crystal, reduce greenhouse gas emission, there is fine environmental benefit, reach steel slag short route and high recycling object simultaneously;
(2) recoverying and utilizing method of steel slag steel slag of the present invention achieves metal Ferrum content≤1wt% in steel slag tailings, the target of Finished Steel scum powder all iron content >=80wt%, the degree of depth achieving iron resources in steel slag solid waste is purified and develops, provide a set of steel slag short route value added applications technology, for steel mill's cost efficiency with open up steel slag recycle approach and made contribution.
Accompanying drawing explanation
The recoverying and utilizing method schema of steel slag in Fig. 1 embodiment 4
The recoverying and utilizing method schema of steel slag in Fig. 2 embodiment 6
Embodiment
Below by way of specific specific examples, technical scheme of the present invention is described.Should be understood that one or more method stepss that the present invention mentions do not repel and before and after described combination step, also to there is additive method step or can also insert additive method step between these steps clearly mentioned; Should also be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.And, except as otherwise noted, the numbering of various method steps is only the convenient tool differentiating various method steps, but not be ordering or the enforceable scope of restriction the present invention of restriction various method steps, the change of its relativeness or adjustment, when changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Low iron metallurgic auxiliary materials
slag former
Converter smelting slag making refers to by controlling kind into slag material and quantity, makes slag have some character, to meet in molten bath about making steel the technological operation of reaction needed.Because the converter smelting time is short, necessary rapid slagging, could meet the requirement of furnace run and strengthening smelting, and slag making simultaneously all has a direct impact avoiding splash, reducing metal loss and improving lining life.Slag former conventional is at present metallurgy lime, and composition CaO is greater than 80wt%, and activity degree is greater than 250.
The 20mm obtained by the recoverying and utilizing method of steel slag of the present invention≤particle diameter < 80mm steel slag can be used as slag former, substitute the technological principle of metallurgy lime slag former: for ease of desiliconization in converter smelting, desulfurization, dephosphorization, shorten smelting cycle, conventional metallurgy lime forms slag fast, also provide protection can be produced to furnace lining, between the general 2.5-3.2 of basicity of slag, 20mm≤particle diameter < 80mm steel slag through obtaining the recoverying and utilizing method of steel slag of the present invention can be used as slag former chemical composition and activity degree detects, its calcium oxide content >=42wt%, average activity degree 260 ~ 300, water ratio≤2wt%, adopt 2 tons of 20mm≤particle diameter < 80mm steel slag can substitute 1 ton of converter slag-making agent completely--metallurgy lime, prove through industrial applications, the 20mm that the recoverying and utilizing method adding steel slag of the present invention obtains≤particle diameter < 80mm steel slag does not have detrimentally affect to steel quality and composition, because slag is a kind of " pre-melt ", change slag time advance on the contrary, shorten the heat 1 minute.
Converter smelting slag making principle:
Si+O
2＝SiO
2Si+2FeO＝2Fe+SiO
2
2CaO+SiO
2＝2CaO·SiO
2
2P+5FeO+3CaO＝5Fe+Ca
3(PO
4)
2
sweetening agent
Pre-desulfurization principle in molten iron: containing a large amount of sulphur in molten iron, for alleviating converter desulfurization and the dark desulfurization pressure of refining procedure, shorten the heat, most of Steel Plant adopt hot metal pretreatment station desulphurization and slag skimming, adopt the sweetening agent such as lime powder, calcium carbide powder (main component is CaO) that sulphur content in molten iron is reduced to below 0.08wt%, utilize converter partial desulfurization and the whole desulfurization of LF refinery practice, sulphur content in molten steel is down to below 0.02wt%, even reaches the Clean Steel production standard that sulphur content is lower.Sulfur Content in Hot Iron exists with chemical formula FeS form, desulphurization reaction principle:
FeS+CaO＝CaS+FeO
In molten iron, CaS impurity enters slag after being separated, because slag light specific gravity, floats on molten steel, just than being easier to removing.Desulfurizing iron object can be realized after adopting slag skimming process.
The particle diameter <2mm steel slag that the recoverying and utilizing method of steel slag of the present invention obtains substitutes the principle of metallurgic auxiliary materials sweetening agent: in the remaining refining slag of casting, basicity is higher, basicity R=m (CaO)/m (SiO
2), CaO mass content>=50wt% in the slag of basicity>=4, sulphur content≤0.04wt%, 2 tons of particle diameter <2mm steel slags are adopted to substitute 1 ton of desulfurization flux--natural lime, not only feasible process, and the consumption of natural lime can be reduced, reduce natural limestone exploitation and calcining cost, reduce CO
2greenhouse gas emission, test proves, reduces calcining 1 ton of Wingdale, can reduce CO
2discharge 0.44 ton.Because in residual casting slag, sulphur content is lower, molten iron reversion phenomenon also can not be caused.Large industrial production test shows: the calcium oxide content >=42wt% of the particle diameter <2mm steel slag that the recoverying and utilizing method of steel slag of the present invention obtains, average activity degree 320 ~ 350, water ratio≤1wt%, 18wt%≤all iron content≤60wt%, is applied in Desulfurization by injecting method and KR mechanical agitation desulfuration technique all feasible.
sintering circuit flux
Calcium oxide content >=the 42wt% of the particle diameter <2mm steel slag that the recoverying and utilizing method of steel slag of the present invention obtains, average activity degree 320 ~ 350, water ratio≤1wt%, 18wt%≤all iron content≤60wt%, ore deposit is joined for sinter machine blending ore, proportioning is 1.5-2.5%, can save agglomerate purchasing of raw materials cost, realizes the short route comprehensive utilization of cost efficiency and steel slag resource.
High ferro metallurgic auxiliary materials
steel-making refrigerant
Due to the by product that steel slag is ferrous metallurgy, it is a kind of pre-melt.Recoverying and utilizing method through steel slag of the present invention obtains 20mm≤particle diameter < 100mm magnetic separation material, all iron content >=96wt%, sulphur content≤0.04wt%, through large commerical test, possesses alternative steel scrap completely and uses as smelting refrigerant.
Select rod mill model:
length=4200mm; Rod iron material: 40Cr; Rod iron diameter:
dress rod amount: 10-20 ton.Magnet separator magnetic induction: 1500-3500Gs.
3mm≤particle diameter < 20mm magnetic separation material is used as steel-making refrigerant
Due to the by product that steel slag is ferrous metallurgy, it is a kind of pre-melt.Recoverying and utilizing method through steel slag of the present invention obtains 3mm≤particle diameter < 20mm magnetic separation material, all iron content >=90wt%, sulphur content≤0.04wt%, through large commerical test, possesses alternative steel scrap completely and uses as smelting refrigerant.
3mm≤particle diameter < 20mm magnetic separation material is used as steel making oxygen agent
Due to the by product that steel slag is ferrous metallurgy, it is a kind of pre-melt.Recoverying and utilizing method through steel slag of the present invention obtains 3mm≤particle diameter < 20mm magnetic separation material, all iron content >=90wt%, sulphur content≤0.04wt%, through large commerical test, possesses alternative agglomerate completely, iron scale uses as smelting oxygenant.
steel making oxygen agent, steel-making cooling material is used as after pelletizing
Recoverying and utilizing method (coordinating Pneumatic separator and the magnetic separation of dry method wind-force after ball mill crushing grinding, two roller magnetic separation) through steel slag of the present invention obtains particle diameter < 3mm magnetic separation material, all iron content>=80wt%, sulphur content≤0.04wt%, it is mixed with water glass or organic binder bond, water glass or organic binder bond addition are 7wt%-18wt%, rolling produces through ball press after stirring
the iron oxide pellet of all iron content>=80wt%, has some strength through natural curing, is used in converter smelting molten steel in mid-term as converter oxygenant.Once molten steel, slag phase interface because of iron oxide content on the low side after, phenomenon that slag there will be " returning dry ", is unfavorable for Impurity removal, has a negative impact to oxygen rifle, now need add iron oxide pellet, to increase interface oxidation iron level, increase slag fluidity.This iron oxide pellet after both alternative part cooling material adds converter, is convenient to liquid steel temperature and is regulated and uniform composition, to determining that tapping temperature has better regulating effect; This iron oxide pellet also can be used as supplementing of oxygen, Substitute For Partial iron ore, agglomerate and pellet, is a kind of well oxygenant, has very good effect to desiliconization and dephosphorization.
Select ball mill model:
length=4500mm; Steel ball material: 40Mn2; Steel ball size:
ball loadings: 30-50 ton.Steel ball matching is:
accounting 30%;
accounting 40%;
accounting 20%;
accounting 10%.Two roll machine magnetic induction density: 4000-8000Gs, magnet drum diameter=500--850mm, magnet drum length 800--1200mm, material thickness controls within 2mm; Pressurized air: anhydrous without oil, below pressure 0--0.4MPa is adjustable; Air knife is arranged: drum shaft is to 3 air knives, and jet angle 120 degree is adjustable, adjustable with magnet drum spacing 0--5mm.
Embodiment 1 pre-treatment
Certain steel mill 100 tons of 40 DEG C of slag scums, water ratio is 10wt%, and surface has 4 pieces of maximum diameter 300mm slag steel surface accumulated slags to reach 8-12mm, and there are 5 pieces of maximum diameter 220mm slag bulks on surface.After adopting 50 tons of 300 DEG C of high temperature sludges fully to mix, pretreatment time 8 hours, find that slag steel surface slag is peeled off completely, achieve effectively being separated of slag and iron, also find bulk slag all natural degradations simultaneously, become fritter and particulate state completely, after mixing pre-treatment, water ratio is 4wt%, calcium oxide content 40wt%, all iron content 32wt%.
Embodiment 2 pre-treatment
Certain steel mill 250 tons of 35 DEG C of slag scums, water ratio is 10wt%, and surface has 5 pieces of maximum diameter 280mm slag steel surface accumulated slags to reach 8-12mm, and there are 8 pieces of maximum diameter 220mm slag bulks on surface.After adopting 100 tons of 230 DEG C of high temperature sludges fully to mix, pretreatment time 10 hours, find that slag steel surface slag is peeled off completely, achieve effectively being separated of slag and iron, also find bulk slag all natural degradations simultaneously, become fritter and particulate state completely, after mixing pre-treatment, water ratio is 3wt%, calcium oxide content 50wt%, all iron content 30wt%.
Embodiment 3 pre-treatment
Certain steel mill 150 tons of 30 DEG C of slag scums, water ratio is 10wt%, after adopting 50 tons of 100 DEG C of high temperature sludges fully to mix, pretreatment time 12 hours, finds that slag steel surface slag is peeled off completely, achieve effectively being separated of slag and iron, also find bulk slag all natural degradations simultaneously, become fritter and particulate state completely, after mixing pre-treatment, water ratio is 5wt%, calcium oxide content 62wt%, all iron content 31wt%.
Embodiment 4 slag former
Turning over slag point from certain steel mill's continuous caster, to retract 10 tank residual casting slag, 18 tons of temperature be 120 DEG C, cool through within 10 hours, being also interrupted to sprinkle water with 37 tons 40 DEG C residual casting slag mixing pre-treatment, after removal casting residue steel, water ratio is 4wt%, calcium oxide content 62wt%, all iron content 20wt%.Then carry out the first screening and obtain 5 tons of particle diameters >=250mm steel scrap and 50 tons of particle diameter < 250mm steel slags, 50 tons of particle diameter < 250mm steel slags carry out first time magnetic separation and obtain 3 tons of particle diameter < 250mm magnetic separation material and 47 tons of particle diameter < 250mm first time magnetic separation steel slags, particle diameter < 250mm first time magnetic separation steel slag carries out second time screening and obtains 27 tons of particle diameter <80mm steel slags and 20 tons of 80mm≤particle diameter < 250mm steel slags, 80mm≤particle diameter < 250mm steel slag carries out second time magnetic separation and obtains 7 tons of particle diameter < 80mm magnetic separation material and 40 tons of particle diameter < 80mm second time magnetic separation steel slags after fragmentation with particle diameter <80mm steel slag, particle diameter < 80mm second time magnetic separation steel slag carries out third time screening and obtains 20 tons of particle diameter <20mm steel slags and 20 tons of 20mm≤particle diameter < 80mm steel slags, particle diameter <20mm steel slag carries out third time magnetic separation and obtains 1 ton of particle diameter < 20mm magnetic separation material and 19 tons of particle diameter < 20mm third time magnetic separation steel slags, described third time magnetic separation steel slag carries out the 4th screening and obtains 2 tons of particle diameter <2mm steel slags and 17 tons of 2mm≤particle diameter < 20mm steel slags, 2mm≤particle diameter < 20mm steel slag carries out third time magnetic separation after fragmentation, re-use, schema is shown in Fig. 1.
Through combination process: the methods such as repeatedly magnetic separation, repeatedly screening, repeatedly fragmentation obtain 20 tons of 20mm≤particle diameter < 80mm steel slag, after testing, this steel slag water ratio is 1wt%, CaO content is 45wt%, average activity degree 280, basicity 3.0, this 20mm≤particle diameter < 80mm steel slag adopts belt elevator to be transported to converter high hopper, to mix with other slag formers adds in converter points for 5 times, 4 tons, every stove, from smelting process, has and changes slag effect in advance, can rapid slagging, desiliconization, dephosphorization effect are obvious.Detect through converter lining, after slag making in advance, reduce the content of silicon and phosphorus in slag, reduce acid slag to lining erosion, converter lining spray repair time shorten 10%, spray repair amount reduces 12%, every stove adds the slag formers such as metallurgy lime 2 tons less, shorten 1 minute tap to tap time, molten steel composition is no abnormality seen also, visible alternative slag former successful.
Embodiment 5 sweetening agent or sintering circuit flux
Recoverying and utilizing method by the steel slag of embodiment 1: the methods such as repeatedly magnetic separation, repeatedly screening, repeatedly fragmentation obtain 19 tons of particle diameter < 2mm steel slags, after testing, the CaO content of this steel slag is 52wt%, average activity degree 330, basicity 3.2, all iron content 18wt%.Groove tank car is adopted to be transported between pretreatment desulfurizing this steel slag, adopt Desulfurization by injecting method technique, random test 5 tank molten iron, substitute lime winding-up residual casting slag powder ratio to be progressively increased gradually by 10%-50%, be blended into stove molten iron through steel making working procedure to detect, no abnormality seen, all reaches pre-desulfurization standard, visible alternative sweetening agent successful.
19 tons of particle diameter < 2mm steel slags, after testing, the CaO content of this steel slag is 52wt%, basicity 3.2, more than all iron content 18wt%, proportioning 2% adds in blending ore, for the preparation of agglomerate, alternative sintering auxiliary material rhombspar and limestone powder, add sinter quality and composition before and after steel-making slag powder and do not change in agglomerate.
Steel making oxygen agent is used as after embodiment 6 pelletizing
Carry out magnetic separation removal tailings after obtaining 3 tons of particle diameter < 250mm magnetic separation material, 7 tons of particle diameter < 80mm magnetic separation material and 1 ton of particle diameter < 20mm magnetic separation material mixing by the recoverying and utilizing method of the steel slag of embodiment 1 and obtain 11 tons of mixing magnetic separation material; Mixing magnetic separation material carries out screening and obtains 9 tons of particle diameters >=20mm magnetic separation material and 2 tons of particle diameter < 20mm magnetic separation material; Particle diameter >=20mm magnetic separation material carries out magnetic separation removal tailings and obtains 6 tons of 20mm≤particle diameter < 100mm magnetic separation material after grinding and screening; Particle diameter < 20mm magnetic separation material is dried and is carried out magnetic separation and screening after grinding, obtains 1.1 tons of 3mm≤particle diameter <20mm magnetic separation material and 0.9 ton of particle diameter < 3mm magnetic separation material.Particle diameter < 3mm magnetic separation material obtains 0.7 ton of particle diameter < 3mm, bis-magnetic separation material through the magnetic separation of dry method wind-force, and schema is shown in Fig. 2.It mixed with water glass or organic binder bond, water glass or organic binder bond addition are 18%, and rolling produces 0.7 ton of iron oxide pellet through ball press, particle diameter after stirring
water ratio 1wt%, through sampling chemical examination, all iron content 82wt%.Belt elevator is adopted to be transported to converter high hopper this iron oxide pellet 24 tons, mid-term is smelted at every stove, slag occurs that " returning dry " time adds, 3 tons, every stove, follow the tracks of the whole converting process of 8 stove molten steel and the liquid steel sampling analysis that add iron oxide pellet, no abnormality seen, and 2.7 tons, oxygenants such as adding iron ore, agglomerate or pellet less compared by every stove, plays cost efficiency effect.
Embodiment 73mm≤particle diameter < 20mm magnetic separation material is used as steel making oxygen agent
Above-mentionedly obtain 1.1 tons of 3mm≤particle diameter <20mm magnetic separation material, water ratio 1wt%, through sampling chemical examination, all iron content 92wt%.8 stoves and steel scrap is divided together to add after this magnetic separation material is run up to 24 tons, every stove adds 3 tons, follow the tracks of the whole converting process of 8 stove molten steel and the liquid steel sampling analysis that add magnetic separation material, no abnormality seen, and 2.7 tons, oxygenants such as adding iron ore, agglomerate or pellet less compared by every stove, plays cost efficiency effect.
Claims (9)
1. a recoverying and utilizing method for steel slag, is characterized in that, comprises the steps:
Carry out first time screening after more than (1) 100 DEG C steel slag and 30 DEG C-40 DEG C steel slag mixing pre-treatment and obtain particle diameter >=250mm steel scrap and particle diameter < 250mm steel slag;
(2) described particle diameter < 250mm steel slag carries out first time magnetic separation and obtains particle diameter < 250mm magnetic separation material and particle diameter < 250mm first time magnetic separation steel slag;
(3) described first time magnetic separation steel slag carry out second time screening obtain particle diameter <80mm steel slag and 80mm≤particle diameter < 250mm steel slag;
(4) described particle diameter <80mm steel slag carries out second time magnetic separation and obtains particle diameter < 80mm magnetic separation material and particle diameter < 80mm second time magnetic separation steel slag;
(5) described second time magnetic separation steel slag carry out third time screening obtain particle diameter <20mm steel slag and 20mm≤particle diameter < 80mm steel slag, described 20mm≤particle diameter < 80mm steel slag be used as slag former;
(6) described particle diameter <20mm steel slag carries out third time magnetic separation and obtains particle diameter < 20mm magnetic separation material and particle diameter < 20mm third time magnetic separation steel slag;
(7) described third time magnetic separation steel slag carries out the 4th screening and obtains particle diameter <2mm steel slag and 2mm≤particle diameter < 20mm steel slag, and described particle diameter <2mm steel slag is used as sweetening agent or sintering circuit flux.
2. the recoverying and utilizing method of steel slag according to claim 1, is characterized in that, the mass ratio of described more than 100 DEG C steel slags and described 30 DEG C of-40 DEG C of steel slags is 1:2-3, pretreatment time 8-12 hour.
3. the recoverying and utilizing method of steel slag according to claim 1, it is characterized in that, after described more than 100 DEG C steel slags and described 30 DEG C-40 DEG C steel slag mixing pre-treatment, water ratio is below 5wt%, calcium oxide content 40wt%-62wt%, all iron content >=20wt%.
4. the recoverying and utilizing method of steel slag according to claim 1, it is characterized in that, 80mm described in step (3)≤particle diameter < 250mm steel slag returns step (3), or carries out described second time magnetic separation to step (4) after fragmentation.
5. the recoverying and utilizing method of steel slag according to claim 1, is characterized in that, 2mm described in step (7)≤particle diameter < 20mm steel slag returns step (6) and re-uses after fragmentation.
6. the recoverying and utilizing method of steel slag according to claim 1, it is characterized in that, calcium oxide content >=the 42wt% of described 20mm≤particle diameter < 80mm steel slag, average activity degree 260 ~ 300, water ratio≤2wt%, the calcium oxide content >=42wt% of described particle diameter <2mm steel slag, average activity degree 320 ~ 350, water ratio≤1wt%, 18wt%≤all iron content≤60wt%.
7. the recoverying and utilizing method of steel slag according to claim 1, is characterized in that, also comprises the steps:
(8) carry out magnetic separation removal tailings after the < of particle diameter described in claim 1 250mm magnetic separation material, described particle diameter < 80mm magnetic separation material and described particle diameter < 20mm magnetic separation material being mixed and obtain mixing magnetic separation material;
(9) described mixing magnetic separation material carries out screening and obtains particle diameter >=20mm magnetic separation material and particle diameter < 20mm magnetic separation material;
(10) described particle diameter >=20mm magnetic separation material carries out magnetic separation removal tailings and obtains 20mm≤particle diameter < 100mm magnetic separation material after grinding and screening, and described 20mm≤particle diameter < 100mm magnetic separation material is used as steel-making refrigerant;
(11) described particle diameter < 20mm magnetic separation material is dried and is carried out magnetic separation and screening after grinding, obtain 3mm≤particle diameter <20mm magnetic separation material and particle diameter < 3mm magnetic separation material, described 3mm≤particle diameter <20mm magnetic separation material is used as steel making oxygen agent or steel-making refrigerant.
8. the recoverying and utilizing method of steel slag according to claim 7, it is characterized in that, described particle diameter < 3mm magnetic separation material obtains particle diameter < 3mm bis-magnetic separation material through the magnetic separation of dry method wind-force, is used as steel making oxygen agent or refrigerant after described particle diameter < 3mm bis-magnetic separation material pelletizings.
9. the recoverying and utilizing method of steel slag according to claim 7, it is characterized in that, all iron content >=the 96wt% of described 20mm≤particle diameter < 100mm magnetic separation material, sulphur content≤0.04wt%, all iron content >=the 90wt% of described 3mm≤particle diameter <20mm magnetic separation material, all iron content >=the 80wt% of sulphur content≤0.04wt%, described particle diameter < 3mm bis-magnetic separation material, sulphur content≤0.04wt%.
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